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mtd: nand: Get rid of busw parameter
Auto-detection functions are passed a busw parameter to retrieve the actual NAND bus width and eventually set the correct value in chip->options. Rework the nand_get_flash_type() function to get rid of this extra parameter and let detection code directly set the NAND_BUSWIDTH_16 flag in chip->options if needed. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Acked-by: Richard Weinberger <richard@nod.at> Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
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@ -3385,8 +3385,10 @@ static void nand_shutdown(struct mtd_info *mtd)
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}
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/* Set default functions */
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static void nand_set_defaults(struct nand_chip *chip, int busw)
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static void nand_set_defaults(struct nand_chip *chip)
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{
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unsigned int busw = chip->options & NAND_BUSWIDTH_16;
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/* check for proper chip_delay setup, set 20us if not */
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if (!chip->chip_delay)
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chip->chip_delay = 20;
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@ -3562,7 +3564,7 @@ static void nand_onfi_detect_micron(struct nand_chip *chip,
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/*
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* Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
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*/
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static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
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static int nand_flash_detect_onfi(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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struct nand_onfi_params *p = &chip->onfi_params;
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@ -3634,9 +3636,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
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chip->blocks_per_die = le32_to_cpu(p->blocks_per_lun);
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if (onfi_feature(chip) & ONFI_FEATURE_16_BIT_BUS)
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*busw = NAND_BUSWIDTH_16;
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else
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*busw = 0;
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chip->options |= NAND_BUSWIDTH_16;
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if (p->ecc_bits != 0xff) {
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chip->ecc_strength_ds = p->ecc_bits;
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@ -3669,7 +3669,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip, int *busw)
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/*
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* Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise.
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*/
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static int nand_flash_detect_jedec(struct nand_chip *chip, int *busw)
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static int nand_flash_detect_jedec(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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struct nand_jedec_params *p = &chip->jedec_params;
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@ -3730,9 +3730,7 @@ static int nand_flash_detect_jedec(struct nand_chip *chip, int *busw)
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chip->bits_per_cell = p->bits_per_cell;
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if (jedec_feature(chip) & JEDEC_FEATURE_16_BIT_BUS)
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*busw = NAND_BUSWIDTH_16;
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else
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*busw = 0;
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chip->options |= NAND_BUSWIDTH_16;
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/* ECC info */
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ecc = &p->ecc_info[0];
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@ -3821,7 +3819,7 @@ static int nand_get_bits_per_cell(u8 cellinfo)
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* chip. The rest of the parameters must be decoded according to generic or
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* manufacturer-specific "extended ID" decoding patterns.
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*/
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static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
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static void nand_decode_ext_id(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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int extid, id_len = chip->id.len;
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@ -3874,7 +3872,6 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
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/* Calc blocksize */
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mtd->erasesize = (128 * 1024) <<
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(((extid >> 1) & 0x04) | (extid & 0x03));
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*busw = 0;
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} else if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX &&
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!nand_is_slc(chip)) {
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unsigned int tmp;
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@ -3915,7 +3912,6 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
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mtd->erasesize = 768 * 1024;
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else
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mtd->erasesize = (64 * 1024) << tmp;
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*busw = 0;
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} else {
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/* Calc pagesize */
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mtd->writesize = 1024 << (extid & 0x03);
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@ -3928,7 +3924,8 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
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mtd->erasesize = (64 * 1024) << (extid & 0x03);
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extid >>= 2;
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/* Get buswidth information */
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*busw = (extid & 0x01) ? NAND_BUSWIDTH_16 : 0;
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if (extid & 0x1)
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chip->options |= NAND_BUSWIDTH_16;
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/*
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* Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per
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@ -3953,8 +3950,7 @@ static void nand_decode_ext_id(struct nand_chip *chip, int *busw)
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* decodes a matching ID table entry and assigns the MTD size parameters for
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* the chip.
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*/
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static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
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int *busw)
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static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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u8 *id_data = chip->id.data;
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@ -3963,7 +3959,6 @@ static void nand_decode_id(struct nand_chip *chip, struct nand_flash_dev *type,
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mtd->erasesize = type->erasesize;
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mtd->writesize = type->pagesize;
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mtd->oobsize = mtd->writesize / 32;
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*busw = type->options & NAND_BUSWIDTH_16;
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/* All legacy ID NAND are small-page, SLC */
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chip->bits_per_cell = 1;
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@ -4026,7 +4021,7 @@ static inline bool is_full_id_nand(struct nand_flash_dev *type)
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}
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static bool find_full_id_nand(struct nand_chip *chip,
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struct nand_flash_dev *type, int *busw)
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struct nand_flash_dev *type)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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u8 *id_data = chip->id.data;
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@ -4044,8 +4039,6 @@ static bool find_full_id_nand(struct nand_chip *chip,
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chip->onfi_timing_mode_default =
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type->onfi_timing_mode_default;
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*busw = type->options & NAND_BUSWIDTH_16;
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if (!mtd->name)
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mtd->name = type->name;
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@ -4106,9 +4099,24 @@ static int nand_get_flash_type(struct nand_chip *chip,
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if (!type)
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type = nand_flash_ids;
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/*
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* Save the NAND_BUSWIDTH_16 flag before letting auto-detection logic
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* override it.
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* This is required to make sure initial NAND bus width set by the
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* NAND controller driver is coherent with the real NAND bus width
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* (extracted by auto-detection code).
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*/
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busw = chip->options & NAND_BUSWIDTH_16;
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/*
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* The flag is only set (never cleared), reset it to its default value
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* before starting auto-detection.
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*/
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chip->options &= ~NAND_BUSWIDTH_16;
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for (; type->name != NULL; type++) {
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if (is_full_id_nand(type)) {
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if (find_full_id_nand(chip, type, &busw))
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if (find_full_id_nand(chip, type))
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goto ident_done;
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} else if (dev_id == type->dev_id) {
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break;
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@ -4118,11 +4126,11 @@ static int nand_get_flash_type(struct nand_chip *chip,
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chip->onfi_version = 0;
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if (!type->name || !type->pagesize) {
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/* Check if the chip is ONFI compliant */
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if (nand_flash_detect_onfi(chip, &busw))
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if (nand_flash_detect_onfi(chip))
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goto ident_done;
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/* Check if the chip is JEDEC compliant */
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if (nand_flash_detect_jedec(chip, &busw))
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if (nand_flash_detect_jedec(chip))
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goto ident_done;
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}
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@ -4136,9 +4144,9 @@ static int nand_get_flash_type(struct nand_chip *chip,
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if (!type->pagesize) {
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/* Decode parameters from extended ID */
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nand_decode_ext_id(chip, &busw);
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nand_decode_ext_id(chip);
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} else {
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nand_decode_id(chip, type, &busw);
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nand_decode_id(chip, type);
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}
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/* Get chip options */
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chip->options |= type->options;
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@ -4158,9 +4166,8 @@ ident_done:
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}
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if (chip->options & NAND_BUSWIDTH_AUTO) {
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WARN_ON(chip->options & NAND_BUSWIDTH_16);
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chip->options |= busw;
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nand_set_defaults(chip, busw);
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WARN_ON(busw & NAND_BUSWIDTH_16);
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nand_set_defaults(chip);
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} else if (busw != (chip->options & NAND_BUSWIDTH_16)) {
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/*
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* Check, if buswidth is correct. Hardware drivers should set
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@ -4169,9 +4176,8 @@ ident_done:
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pr_info("device found, Manufacturer ID: 0x%02x, Chip ID: 0x%02x\n",
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maf_id, dev_id);
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pr_info("%s %s\n", nand_manuf_ids[maf_idx].name, mtd->name);
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pr_warn("bus width %d instead %d bit\n",
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(chip->options & NAND_BUSWIDTH_16) ? 16 : 8,
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busw ? 16 : 8);
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pr_warn("bus width %d instead of %d bits\n", busw ? 16 : 8,
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(chip->options & NAND_BUSWIDTH_16) ? 16 : 8);
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return -EINVAL;
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}
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@ -4399,7 +4405,7 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
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return -EINVAL;
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}
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/* Set the default functions */
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nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
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nand_set_defaults(chip);
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/* Read the flash type */
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ret = nand_get_flash_type(chip, table);
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